Mapping the WinCC OA status bits

The OPC server maps the following WinCC OA bits onto the OPC Quality bits, which the OPC client evaluates:

If _online.._bad = FALSE, i.e. the value is valid, then it is set according to _online.._default:

• FALSE (0): good, non-specific (110000LL)

• TRUE (1): good, local override (110110LL)

If, on the other hand, the value is invalid, i.e. _online.._bad = TRUE, then both _online.._default = TRUE or = FALSE are mapped onto bad non-specific (000000LL).